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研究生： Nguyen-Nghia Do
Nguyen-Nghia Do
論文名稱： A Novel Charge Balancing Circuit Topology Based on Buck-Boost Converter with Multiple Bidirectional Energy-Transference Paths
A Novel Charge Balancing Circuit Topology Based on Buck-Boost Converter with Multiple Bidirectional Energy-Transference Paths
指導教授： 邱煌仁
Huang-Jen Chiu
謝耀慶
Yao Ching Hsieh
口試委員: 林景源
Jing-Yuan Lin
學位類別： 碩士
Master
系所名稱： 電資學院 - 電子工程系
Department of Electronic and Computer Engineering
論文出版年： 2018
畢業學年度： 106
語文別： 英文
論文頁數： 74
中文關鍵詞： 主動平衡電路 、電源轉換器 、多雙向電荷傳輸路徑 、鋰電池 、串聯的電池組 、DSP 、快速平衡
外文關鍵詞： active balancing circuit, power converter-based, multiple bidirectional charge- transference paths, Lithium-Ion battery, series-connected battery string, DSP, fast balancing
相關次數： 點閱：283  下載：6 
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    • 高效率及高可靠度的能量儲存模組像是可充電電池和超級電容對於電動車以及使用電池提供能量的應用是一項相當重要的要素。在數次的充放電週期後，各電池間的不平衡會導致串聯的鋰電池的過早惡化；因此，電池平衡在電池壽命維持和電池組的可用容量最佳化扮演著相當重要的腳色。
    　　此論文呈現一個基於多雙向電荷傳輸路徑串接電池組電源轉換器的主動平衡系統。以此方式，電池能量可以在多個單電池間動態傳輸，並且同步整個電池組藉此達到平衡速率的提升。除此之外，為了要達到更好的效率，我們應用了監測系統並以DSP為主要控制演算法來感測並且調節整體平衡時的電池電壓。以此監測方式，間接的電荷傳輸可以被減少。
    　　實驗以及模擬結果用以證實被提出的電荷平衡理論分析(有能夠快速平衡、低成本、控制方法簡單的特點)，方便實作以及有彈性的平衡機構。以此結果，平衡的過程可以在兩小時後被達成，並且各電池的電壓差距在30mV以內，也支持提出的電荷平衡電路拓樸的適用性。

    A high-efficiency and high-reliability management system of energy storage modules such as rechargeable batteries and even accompanying super-capacitors (SCs) and is one of the crucial factors in electric vehicles and other battery-powered applications. The inhomogeneity among individual cells after several charge/discharge cycles leads to premature deterioration of series-connected lithium-ion battery string. Therefore, cell balancing serves as an indispensable role on the battery life preservation and the usable capacity optimization of the battery stack.
    This thesis presents an active balancing system based on power converter for series-connected battery cells with multiple bidirectional charge-transference paths. In this method, battery energy can be dynamically transferred among multiple cells and the entire battery stack simultaneously so that the balancing speed is upgraded. In addition, in order to achieve better efficiency, a monitor system and a DSP centralized control algorithm are applied to detect and regulate the voltages of battery cells during the whole equilibration. By this monitoring, indirect charge transferences can be minimized.
    The experimental and simulation results are provided to confirm the theoretical analysis of proposed charge equalizer, which is capable of a fast balancing, low cost, simple control method, ease of implementation, as well as a flexible equalization mechanism. From these results, the equalization process can be accomplished after no more than 2 hours with voltage gap between cells of 30mV, which upholds the applicability of the proposed charge balancing circuit topology.

    TABLE OF CONTENTS ABSTRACT i 摘　要 ii DEDICATION iii ACKNOWLEDGEMENT iv THESIS STATEMENT v TABLE OF CONTENTS vi LIST OF FIGURES viii LIST OF TABLES xi LIST OF ABBREVIATIONS xii CHAPTER 1 INTRODUCTION 1 1.1 Context and Motivation 1 1.2 Concepts of Lithium-Ion Battery 3 1.2.1 Categories of Lithium-Ion Battery 3 1.2.2 Li-Ion Battery Capacity, SOC and C-rate 8 1.2.3 Li-Ion Battery Charge and Discharge 10 1.3 Research Framework 11 CHAPTER 2 LITERATURE REVIEW 12 2.1 Related Work 12 2.1.1 Dissipative Balancing Approach 12 2.1.2 Nondissipative Balancing Approach 13 2.2 Battery Management System (BMS) 18 CHAPTER 3 PROPOSED CHARGE EQUALIZATION CIRCUIT 19 3.1 Circuit Topology 19 3.2 Principle of Operation 20 3.3 Simulation of the Proposed Circuit 30 3.4 Balancing Control Strategy 33 3.4.1 Duty Ratio Derivation 33 3.4.2 Digital Control Algorithm 36 3.5 Modularization of Lithium-ion Battery Balancing Circuit 39 CHAPTER 4 HARDWARE IMPLEMENTATION AND EXPERIMENTAL RESULTS 41 4.1 Design of Power Components 41 4.1.1 Design the Inductor 42 4.1.2 Power MOSFET 44 4.2 Digital Signal Processor 45 4.3 Experimental Result and Analysis 46 4.4 Assessment of the Proposed Battery Balancing Circuit 54 CHAPTER 5 CONCLUSION AND FUTURE WORK 55 5.1 Conclusion 55 5.2 Future Work 55 REFERENCES 56

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